The Fastenal Top Lock Nut is the perfect choice for any project requiring a secure and reliable fastening solution. The zinc plating helps to retard corrosion and extend the lifespan of the washer, while the coarse thread design ensures a strong grip and efficient installation. The imperial system ensures precise measurements for compatibility and ease of use and the steel material construction ensures a durable and long-lasting product. FleetPride is your First Click in Heavy Duty®.